Alloy 59 (UNS N06059) is a high-chromium, high-molybdenum nickel-base alloy designed to provide the widest possible range of corrosion resistance under both oxidizing and reducing conditions. After its introduction some 6 years ago, it rapidly established itself as the prime alloy for many high-severity applications, Of these, flue gas desulfhrization (FGD) systems have become the biggest. Increasingly, however, alloy 59 has found application in many other industries. After briefly recalling the principal properties of alloy 59, the paper describes a number of applications which demonstrate the versatility of this alloy. These include, in addition to FGD, the chemical industry, the pharmaceutical industry, metals processing, aluminium refining and welding. Mention is made of the excellent fabrication characteristics of alloy 59, which make it easier to ensure that its corrosion-resistant properties are replicated in fabricated components.
Keywords: Alloy 59, UNS N06059, flue gas desulphurization, methacrylate synthesis, aluminium refining, fine chemicals production, chloride salts, localized corrosion.